Merge pull request #602 from itsenkov/itsenkov/master/bsod-adb-fix

bugfix: Handle zero-len packets from ADB to avoid BSOD

Usbipd/AttachedClient.cs

@@ -348,6 +348,8 @@ async Task HandleSubmitAsync(UsbIpHeaderBasic basic, UsbIpHeaderCmdSubmit submit
             }
             pending = true;
 
+            if (buf.Length > 0)
+            {
                 // Input or output, exceptions or not, this buffer must be locked until after the ioctl has completed.
                 var gcHandle = GCHandle.Alloc(buf, GCHandleType.Pinned);
                 try
@@ -366,6 +368,13 @@ async Task HandleSubmitAsync(UsbIpHeaderBasic basic, UsbIpHeaderCmdSubmit submit
                     gcHandle.Free();
                 }, CancellationToken.None, TaskContinuationOptions.ExecuteSynchronously, TaskScheduler.Default);
             }
+            else
+            {
+                urb.buf = IntPtr.Zero;
+                StructToBytes(urb, bytes);
+                ioctl = Device.IoControlAsync(SUPUSB_IOCTL.SEND_URB, bytes, bytes);
+            }
+        }
 
         // At this point we have initiated the ioctl (and possibly awaited it for special cases).
         // Now we schedule a continuation to create the response once the ioctl completes.